body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            min-height: 100vh;
            background-size: cover;
            background-attachment: fixed;
            background-position: center;
            color: #333;
            line-height: 1.6;
        }

        header {
            background: rgba(0, 0, 0, 0.8);
            color: white;
            padding: 1em;
            text-align: center;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
        }

        header h1 {
            margin: 0;
            font-size: 2.5em;
        }

        nav ul {
            list-style-type: none;
            padding: 0;
            display: flex;
            justify-content: center;
            margin: 1em 0;
        }

        nav ul li {
            margin: 0 1em;
            position: relative;
        }

        nav ul li a {
            color: white;
            text-decoration: none;
            font-weight: bold;
            padding: 0.5em 1em;
            border-radius: 5px;
            transition: background 0.3s, transform 0.3s;
        }

        nav ul li a:hover {
            background: rgba(255, 255, 255, 0.3);
            transform: scale(1.1);
        }

        main {
            padding: 2em;
            background: rgba(255, 255, 255, 0.9);
            border-radius: 10px;
            margin: 2em auto;
            max-width: 1200px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        }

        a {
            text-decoration: none;
        }

        section {
            margin-bottom: 2em;
        }

        section h2 {
            font-size: 2em;
            margin-bottom: 1em;
            color: #555;
            cursor: pointer;
        }

        section p {
            margin-bottom: 1em;
            font-size: 1.1em;
        }

        .profile-img {
            width: 100%;
            max-width: 300px;
            border-radius: 10px;
            display: block;
            margin-bottom: 1em;
        }

         .category {
                    margin-top: 20px;
                    display: none; /* 初始隐藏 */
                }
        
                .category.active {
                    display: block; /* 当前展开时显示 */
                }
        
                .category p {
                    font-weight: bold;
                    cursor: pointer;
                }
        
                .category ul {
                    margin-top: 10px;
                }
        
                .category ul li {
                    margin-bottom: 5px;
                }

        #projects-list {
            display: flex;
            flex-direction: column;
            gap: 2em;
        }

        .project {
            display: flex;
            flex-direction: column;
            background: rgba(255, 255, 255, 0.9);
            border-radius: 10px;
            padding: 1em;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        }

        .project h2 {
            margin-bottom: 1em;
            cursor: pointer;
        }

        .icon {
            display: inline-block;
            width: 24px;
            height: 24px;
            background-size: cover;
            vertical-align: middle;
            margin-right: 0.5em;
        }

        .icon-email {
            background-image: url('../img/email.jpg');
        }

        .icon-phone {
            background-image: url('icons/phone.svg');
        }

        .icon-location {
            background-image: url('icons/location.svg');
        }

        .dropdown-content {
            display: none;
            position: absolute;
            background-color: #f9f9f9;
            box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
            z-index: 1;
            min-width: 80px;
        }

        .dropdown-content a {
            color: black;
            padding: 12px 16px;
            text-decoration: none;
            display: block;
        }

        .dropdown-content a:hover {
            background-color: #f1f1f1;
        }

        .dropdown:hover .dropdown-content {
            display: block;
        }

        .video-container {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            overflow: hidden;
            z-index: -1;
        }

        video {
            width: 100%;
            height: 100%;
            object-fit: cover;
            position: absolute;
            top: 0;
            left: 0;
        }

        footer {
            background: rgba(0, 0, 0, 0.8);
            color: white;
            text-align: center;
            padding: 0.5em 0;
            position: fixed;
            width: 100%;
            bottom: 0;
            box-shadow: 0 -2px 4px rgba(0, 0, 0, 0.2);
        }

        footer p {
            margin: 0 auto;
        }

        #back-to-top {
            position: fixed;
            bottom: 50px;
            right: 50px;
            display: none;
            width: 50px;
            height: 50px;
            background: rgba(149, 250, 255, 0.7);
            color: white;
            border-radius: 50%;
            text-align: center;
            line-height: 50px;
            cursor: pointer;
            z-index: 1000;
        }

        #back-to-top:hover {
            background: rgba(0, 0, 0, 0.7);
        }
		
		.toggle-btn {
			background-color: #007bff;
			width: 140px;
			color: white;
			border: none;
			padding: 10px 20px;
			border-radius: 5px;
			cursor: pointer;
			transition: background-color 0.3s ease;
		}

		.toggle-btn:hover {
			background-color: #0056b3;
		}